Fire is the unsung hero of human evolution. We could not have turned into the big-brained, deep-thinking animals we are on raw food alone. The moment two million years ago that our forebears first started using fire to cook, was the spark that started everything off.

That's according to today's guest - Richard Wrangham one of the world's leading anthropologists and author of Catching Fire: How Cooking Made Us Human

Edited by Tom Delargy, Produced by Alex Carlon & Freddy Chick, Senior Producer is Charlotte Long

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